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You and your cat will both benefit from adding an animal flap into your bifold door. It can also stop extreme cold or heat from entering your home. The first step is to measure your pet in order to determine the size of door flap is needed. This will help you design an opening for your cat flap that is the correct size. Outdoor Access Even those with no DIY skills can install a cat flap onto an outside backdoor. This will save you the cost and hassle of contacting an expert joiner, carpenter o